Nut-lock.



Unrrnn snares earner @FFICE.

WILLIAM OHESTERMAN, OF WALSTON, PENNSYLVANIA, ASSIGNOR OF ONEJFOURTII TO D. SMILEY, ONE-FOURTH TO L. B. BU'IERBAUGH, AND ONE-FOURTH TO I). W. RICHARDS, OF

WALSTON, PENNSYLVANIA.

Nor-Loon.

Specification of Letters Patent.

Patented Feb. 4, 1908.

Application filed January. 17 1907. Serial No. 352.754-

- of Pennsylvania, have invented'certain new and useful Improvements in Nut-Locks and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 1 'ihis invention relates to an improved nut The object of the invention. is to provide a simple and ethcient nut lock which will hold thl: nut in adjusted position until released by a ey.

In the accompanying drawings, Figure 1 represents a side elevation of a bolt with a nut provided with this improved lock applied thereto; Fig. 2 represents a section taken on the line 22 of Fig. 1; Fig. 3 represents a detail perspective view 01' the pawl; Fig. 4 represents a perspective view of the releasing key; and Fig. 5 represents a top plan view of the spring detached.

In the embodiment herein illustrated, a bolt 1 of ordinary construction is provided with angular grooves, as 2, extending longi tudinally through its threaded portion, said grooves being of substantially V-shape in cross section and each presenting a straight and a rearwardly inclined wall. A nut 5 of ordinary construction has a recess or slot 6 extending through one. side wall thereof. Said recess or slot 6 terminates near one corner of the nut at one end, and has an open end extending through another corner of the nut. In this recess 6, preferably at the open end, is ivoted a dog or pawl 7, the free end of whic is provided with a substantially V-shaped engaging ortion to seat in the longitudinal grooves 1n the bolt and prevent .the backward turning of the nut, the rear face of said engaging portion being inclined to accord with and ride freely over the inclined walls oi the grooves. The pivoted end of said pawl is cylindrical in shape and fits snugly against the sides and bottom of the slot or recess 6 and lies entirely Within said recess or slot. Riveted to the nut 5 on the same edge having recess 6 and at the o' 0- site corner from the dog 7 is a T-shaped dat spring 8, the free end of which extends into said recess 6 and bears on the dog 7 to hold-it securely in engagement with the walls of the groove in the bolt. This spring 8 is preferably made T-shaped, as shown in Fig. 5, with its free end preferably beveled, as shown clearly in Fig. 2, to more closely engage the top of the dog 7 and hold it against backward movement. "I he spring and pawl, which are of a width equaling that of the recess, conjointly form a closure for the latter to prevent the entrance 01"" dust or other foreign matters thereinto. T hearms of said T- formed by a cut-away portion in the face of said nut, as shown, and lie flush with the wrench-receiving face of the nut. In oneface of the nut, about midway thereof is a key-hole 9, which extends through into the recess 6 in which the dog is disposed. When it is de sired to remove the nut from th bolt, a key 10 is inserted through the hole 9 and turned to lift the dog out of engagement with the groove 2 in the bolt 1, and the nut may then i be unscrewed from the bolt and removed, it being held safely on the bolt until released by the person carrying the key whereby tampering with the nut and removal thereof is prevented except by the person authorized.

I claim as my inventionz 1. In a device of the class described, in combination, a bolt having a plurality of longitudinal grooves extending through its threaded portion, said grooves being substantially \l-shaped and each comprising a radial and a rearwardly inclined wall, a nut having Wrench-receiving faces and an internally threaded opening to receive the bolt and provided in one edge with a recess communicating with said openingand terminating in an open end atone corner of the nut and in a closed end near the adjacent corner, a locking pawl having a transversely disposed cylindrical end pivoted at the open end of said recess with said cylindrical end lying entirely within said recess and lying at all three adjacent walls of said recess, the free end of said pawl being provided with a pointed tooth adapted to fit in said V-shaped movement, but adapted to ,slide freely over said grooves during aforward movement, shoulders on one of said wrench receiving faces and near the closed end of said recess and formed by a cut-away portion, a T- shaped spring fit snugly against the shoulders positions of movement in. contact with the groove for locking the nut against retrograde shaped leaf spring having arms adapted to fit said cut away portion and to be flush with the adjacent wrenchreceiving faces, the body part of said spring closely fittin said recess and. having a tapering bevele end adapted'to press on said pawl and form a substantially unbroken surface therewith, said leaf spring andsaid pawl closely fitting said recess and forming a closure therefor,- and a key-hole in the face of said nut adapted to receive a key for rotation directly under said pawl to unlock the same, the moving parts being arranged to lie at'all times within the wrenc receivln faces of the nut.

2, In a device 0 the class described, in combination, a bolt having a plurality of longitudinal grooves extending through its threaded portion, said grooves being sub stantially V-shaped in cross section and each presentin' a straight and a rearwardly inclined wa l, a nut having an opening'internally threaded to receive the bolt and provided in one edge with a recess commun1cating with said opening and terminating in an 0' on end at one corner of the nut and in a c osed end near the ad'acent corner, a locking pawl pivoted in sai recess at one end and provided at its free end with a tooth to engage the if-shaped grooves for locking the portion adapted to project into said'recess and to bear upon the free end of said pawl said pawl and the body portion of said awl being of a widthequahng that of sai recess and jointly forming a closure therefor, and a key hole in the face of the nut adapted to receive a key for rotation immediately under the awl to raise the same,. the parts of the nut eing so arranged that the movable iarts remain Within the plane of the wreno-receiVing surfaces when the nut. is rotated. v

In testimony whereof I have hereunto set I my hand in presence of two subscribing witnesses. o WILLIAM CHESTERMAN. Witnesses 4 H O. J. MCOARTNEY,

W. MGMILLEN. 

